From 205978958fb9e08c662a284712dc41b4930e9cc0 Mon Sep 17 00:00:00 2001
From: Patrick Kidger <33688385+patrick-kidger@users.noreply.github.com>
Date: Mon, 6 Nov 2023 10:33:59 -0800
Subject: [PATCH] Fix install_import_hook(..., None)

---
 jaxtyping/_import_hook.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jaxtyping/_import_hook.py b/jaxtyping/_import_hook.py
index f2a551e..10f7f69 100644
--- a/jaxtyping/_import_hook.py
+++ b/jaxtyping/_import_hook.py
@@ -109,7 +109,7 @@ class Typechecker:
 
         elif typechecker is None:
             # If it is None, ignore it silently (use dummy decorator)
-            self.hash = 0
+            self.hash = "0"
             Typechecker.lookup[self.hash] = lambda x, *_, **__: x
         else:
             # Passed typechecker is invalid